Metal detection system using a search coil type sensor

Abstract

An embodiment of the present invention provides a technique for detecting a specific object such as a firearm and tracking such an object. A metal detection system using a detection coil type sensor based on an embodiment of the present invention includes: a sensor module including at least one sensor for detecting an object moving around, the sensor having a housing, a core, and a coil, the housing having an internal space, the core being formed to be introduced into the internal space of the housing, and the coil being wound around a part of the outer peripheral surface of the housing corresponding to the position of the core; an imaging unit for imaging an object moving around the sensor module or a person carrying an object; an impedance matching unit connected to the sensor module to perform impedance matching; and an amplification unit connected to the impedance matching unit to amplify a micro current and a micro voltage generated when an object approaches the sensor module.

Description

Technical Field

[0001] The present invention relates to a metal detection system using a detection coil type sensor, and more particularly, to a technique for detecting a specific object such as a firearm and tracking such an object. Background Art

[0002] In magnetic sensors, various technologies such as Squid, Fiber - Optic, Flux - Gate, and Magnetic Impedance have been adopted and highly developed and applied in various required industrial fields. In particular, with the advent of the Fourth Industrial Revolution, various IoT application products have emerged, and the scope of application of magnetic sensor technology in the daily life field is also expanding.

[0003] Subsequently, companies such as Samsung Electronics in Korea and Honeywell abroad are researching magnetic sensors in the form of chips that are further miniaturized, and various research and developments are being carried out to improve the detection sensitivity or range and reduce detection errors.

[0004] Furthermore, recently, accidents caused by firearms have increased in the United States and other places. As a result, the interest and demand for systems for improving the detection performance of specific objects such as firearms are increasing.

[0005] In Korean Patent Registration No. 10 - 0867375 (invention title: Device and method for measuring the position and direction information of a moving body using three magnetic sensors), a method is disclosed, including: a setting step of setting two magnetic sensors corresponding to the planes formed by the x and y axes on the moving body, and setting a magnetic sensor corresponding to the z axis on the moving body; a storing step of the moving body measuring the geomagnetic fields corresponding to the respective x, y, and z axes and storing the information values of the reference magnetic fields in an internal memory; a judging step of the moving body measuring the magnitudes of the magnetic fields for the x, y, and z axes while moving, and then judging whether the absolute value of the difference between the measured z - axis magnetic field value and the z - axis reference magnetic field value is less than the error range of the magnetic sensor; and an updating step of updating the direction information value of the moving body using the x and y axis magnetic field measurement values when it is judged in the judging step that the absolute value of the difference between the measured value of the z axis and the reference value is less than the error range of the sensor.

[0006] Prior Art Documents

[0007] Patent Document: Korean Patent Registration No. 10 - 0867375 Summary of the Invention

[0008] Technical Problem to be Solved

[0009] An object of the present invention for solving the above problems is to be able to detect the position, displacement, etc. of an object by using the micro-magnetic field of an iron-containing object without applying any changes to a core and a coil that do not have a magnetic component.

[0010] Moreover, an object of the present invention is to prevent detection lag due to a range where the magnetic field temporarily weakens (non-polar range) when the polarity changes with respect to the sensor as the iron-containing object moves.

[0011] In addition, an object of the present invention is to be able to perform position measurement, etc. for multiple objects and to be able to judge the movement paths of each of the multiple objects.

[0012] Moreover, an object of the present invention is to detect a specific object such as a firearm and to track such an object.

[0013] The technical problems to be solved by the present invention are not limited to the above technical problems, and for other technical problems not mentioned, those skilled in the art should be able to clearly understand according to the following description.

[0014] Means for Solving the Problem

[0015] The structure of the present invention for achieving the above object includes: a sensor module including at least one sensor for detecting an object moving around, the sensor having a housing, a core, and a coil, the housing having an internal space, the core being formed to be introduced into the internal space of the housing, and the coil being wound around a part of the outer peripheral surface of the housing corresponding to the position of the core; a camera unit for photographing the object moving around the sensor module or a person carrying the object; an impedance matching unit connected to the sensor module for performing impedance matching; and an amplification unit connected to the impedance matching unit for amplifying a micro-current and a micro-voltage generated when the object approaches the sensor module, the sensor module forming an induced magnetic field through a change in the distance from the iron (Fe)-containing object, and analyzing the object by using information based on the sensor module and a photographed image obtained through the camera unit.

[0016] In an embodiment of the present invention, it may include: a first control unit connected to the amplification unit for analyzing the waveforms of the amplified current and voltage; and a second control unit connected to the first control unit for generating object analysis information for analyzing the movement and magnetic density of the object, and collecting the photographed image by being connected to the camera unit.

[0017] In an embodiment of the present invention, the second control unit can perform classification of the object by using the object analysis information and the photographed image.

[0018] In one embodiment of the present invention, after determining whether the magnetic flux density of the object is included in a predetermined magnetic flux density range, the second control unit can determine the type of the object by using the captured image.

[0019] In one embodiment of the present invention, when the object is determined to be a firearm, the second control unit can generate a warning signal.

[0020] In one embodiment of the present invention, it may include: an output unit, connected to the second control unit, visually outputting the position change of the object and outputting the warning signal.

[0021] In one embodiment of the present invention, a plurality of the sensor modules may be formed, and the impedance matching unit and the amplifying unit are respectively connected to the plurality of sensor modules.

[0022] In one embodiment of the present invention, the plurality of sensors can be arranged in parallel or radially.

[0023] In one embodiment of the present invention, the plurality of coils included in the sensor are arranged in series.

[0024] The metal detection system using a detection coil type sensor according to the present invention for achieving the above object includes: a sensor module including at least one sensor for detecting a moving object around, the sensor having a housing, a core, and a coil, the housing having an internal space, the core being formed to be introduced into the internal space of the housing, and the coil being wound around a part of the outer peripheral surface of the housing corresponding to the position of the core; a camera unit for photographing the object moving around the sensor module or a person carrying the object; an impedance matching unit connected to the sensor module to perform impedance matching; and an amplification unit connected to the impedance matching unit to amplify a micro current and a micro voltage generated when the object approaches the sensor module. The sensor module forms an induced magnetic field due to a change in the distance from the iron-containing object, and analyzes the object by using information based on the sensor module and a photographed image obtained through the camera unit. The metal detection system using a detection coil type sensor further includes: a first control unit connected to the amplification unit; and a second control unit connected to the first control unit and the camera unit. The first control unit is configured to: store data of respective signal patterns for the magnetic flux density and speed of each of a plurality of objects detected by the sensor module and a composite pattern when two or more signal patterns overlap, determine each of the plurality of objects by separating the respective signal patterns to generate separated signal patterns of the plurality of objects; The second control unit is configured to: receive the separated signal patterns of the plurality of objects from the first control unit, collect the photographed images photographed by the camera unit, determine whether the magnetic flux density of each of the plurality of objects is included in a predetermined magnetic flux density range to classify each of the plurality of objects, and when each of the plurality of objects is exposed, use the photographed image to determine the type of each of the plurality of objects, and when each of the plurality of objects is not exposed, use the thermal sensing function of the camera unit to determine the type of each of the plurality of objects by collecting the thermal images of each of the plurality of objects.

[0025] Effects of the Invention

[0026] The effects of the present invention based on the above structure are as follows: It can detect changes in the micro magnetic field and magnetic flux of iron-containing objects, and can detect the position, displacement, etc. of iron-containing objects with ultra-low power.

[0027] Moreover, the effects of the present invention also include that when the iron-containing object is displaced and the polarity changes with respect to the sensor, even when there is a range where the magnetic field temporarily weakens (non-polarity range), the magnetic field of the iron-containing object can be detected by other adjacent sensors or coils, and the device can operate normally and continuously.

[0028] In addition, the effect of the present invention is also that detection and measurement can be performed regardless of the configuration of the sensor or the sensor module, etc.

[0029] Moreover, the effect of the present invention is also that position measurement, etc. of multiple objects can be performed using multiple sensor modules, so that the movement paths of the multiple objects can be judged, etc.

[0030] Moreover, the effect of the present invention is also that by performing the measurement of an object in a composite manner using the object analysis information based on the sensor module and the captured image based on the imaging unit, the measurement speed and measurement accuracy of the object can be improved.

[0031] Moreover, the effect of the present invention is also that the change in the micro magnetic field and magnetic flux of an iron-containing object can be detected, so the same performance can be exerted without being affected by air, soil, water, etc.

[0032] It should be understood that the effects of the present invention are not limited to the above effects, and also include all effects that can be inferred from the invention structure described in the specification or claims of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 and Figure 2 is a schematic diagram of a metal detection system based on an embodiment of the present invention.

[0034] Figure 3 is a schematic diagram of a sensor based on the first embodiment of the present invention.

[0035] Figure 4 is a schematic diagram of a sensor module based on the first embodiment of the present invention.

[0036] Figure 5 is a schematic diagram of a sensor based on the second embodiment of the present invention.

[0037] Figure 6 is a schematic diagram of a sensor module based on the second embodiment of the present invention.

[0038] Figure 7 is a schematic diagram of the magnetic field region of the sensor based on each embodiment of the present invention.

[0039] Figure 8 is a schematic diagram of a sensor based on the third embodiment of the present invention.

[0040] Figure 9 is a schematic diagram of a sensor module based on the third embodiment of the present invention.

[0041] Figure 10 is a schematic diagram of a sensor module based on the fourth embodiment of the present invention.

[0042] Figure 11 and Figure 12 is a diagram of the signal pattern when an object passes through the sensor based on the first embodiment of the present invention. Detailed Description of the Invention

[0043] The most preferred embodiment of the present invention includes: a sensor module including at least one sensor for detecting a moving object around, the sensor having a housing, a core, and a coil, the housing having an internal space, the core being formed to be introduced into the internal space of the housing, and the coil being wound around a part of the outer peripheral surface of the housing corresponding to the position of the core; a camera unit for photographing the object moving around the sensor module or a person carrying the object; an impedance matching unit connected to the sensor module to perform impedance matching; and an amplification unit connected to the impedance matching unit to amplify the micro current and micro voltage generated when the object approaches the sensor module. The sensor module forms an induced magnetic field due to a change in the distance from the object containing iron (Fe), and analyzes the object using the information based on the sensor module and the photographed image obtained through the camera unit.

[0044] Hereinafter, the present invention will be described with reference to the drawings. However, the present invention can be implemented in various different ways and is not limited to the embodiments described herein. Also, in the drawings, parts not related to the description are omitted for clarity, and throughout the specification, like parts are given like reference numerals.

[0045] Throughout the specification, when it is described that a certain part is "connected (connected continuously, in contact, combined)" with another part, it includes not only the case of "direct connection" but also the case of "indirect connection" via other components in between. In addition, when it is described that a certain part "includes" a certain structural element, without particular emphasis, it does not intend to exclude other structural elements, but may also include other structural elements.

[0046] The terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural cases as well, unless clearly indicating a different meaning in the context. It should be understood that in this specification, terms such as "including" or "having" are intended to indicate the existence of the features, numbers, steps, actions, structural elements, components, or combinations thereof described in the specification, and do not exclude the existence or additional possibility of one or more other features, numbers, steps, actions, structural elements, components, or combinations thereof.

[0047] Hereinafter, the present invention will be described in detail with reference to the drawings.

[0048] Figure 1 andFigure 2 is a schematic diagram of a metal detection system according to an embodiment of the present invention. In addition, Figure 3 is a schematic diagram of the sensor 100 according to the first embodiment of the present invention, Figure 4 is a schematic diagram of the sensor module 10 according to the first embodiment of the present invention. In addition, Figure 5 is a schematic diagram of the sensor 100 according to the second embodiment of the present invention, Figure 6 is a schematic diagram of the sensor module 10 according to the second embodiment of the present invention. And, Figure 7 is a schematic diagram of the magnetic field region of the sensor 100 according to each embodiment of the present invention. Here, Figure 7 (a) of is a diagram showing the case where the iron (Fe)-containing object 70 moves relative to the sensor module 10 according to the first embodiment of the present invention, Figure 7 (b) of is a diagram showing the case where the iron (Fe)-containing object 70 moves relative to the sensor module 10 according to the second embodiment of the present invention. The direction can be set based on the up, down, left, and right of each drawing. The same applies hereinafter. In the drawings of the present invention, for convenience, the N pole and the S pole are shown for the iron (Fe)-containing object 70, but it does not mean that the object 70 itself is a magnet or an electromagnet. In Figure 4 , Figure 6 and Figure 9 , the first control unit 41 and the second control unit 42 are respectively connected, but this only indicates the signal transmission with arrows, and does not mean that each sensor module 10 separately forms the first control unit 41 and the second control unit 42.

[0049] As Figures 1 to 3 shown, the metal detection system of the present invention includes: a sensor module 10, which includes at least one or more sensors 100 to detect the object 70 moving around, the sensor 100 includes a housing 130, a core 110, and a coil 120, the housing 130 has an internal space, the core 110 is formed to be introduced into the internal space of the housing 130, and the coil 120 is wound around a part of the outer peripheral surface of the housing 130 corresponding to the position of the core 110; a camera unit 60 to capture an image of the object 70 moving around the sensor module 10 or a person carrying the object 70; an impedance matching unit 20, which is respectively connected to a plurality of sensor modules 10 to perform impedance matching; and an amplification unit 30, which is connected to the impedance matching unit 20 to amplify the micro current and micro voltage generated when the object 70 approaches the sensor module 10.

[0050] The sensor module 10 can form an induced magnetic field through the change in distance from an iron (Fe)-containing object 70. That is, in the sensor 100, an induced magnetic field can be formed through the change in distance from an iron (Fe)-containing object 70. The iron (Fe)-containing object 70 has a micro magnetic field by virtue of the property of magnetic iron (Fe). Through the movement or direction change of such an iron (Fe)-containing object 70, an induced magnetic field can be formed in the sensor 100.

[0051] Specifically, the core 110 has no magnetic component at all, and an induced magnetic field can be formed in the sensor 100 by the approach or separation of the magnetic field possessed by the iron-containing object 70. Moreover, through the generation of the induced magnetic field as described above, a micro current and a micro voltage can be formed in the coil 120. That is to say, with the above structure, even if the magnetic flux generated by the iron (Fe)-containing object 70 on the core 110 is in nano units, or the magnetic field generated by the iron (Fe)-containing object 70 has a magnetic flux density of several mm gauss or less, whenever the position or direction of the iron (Fe)-containing object 70 changes, the magnetic flux generated on the core 110 can be detected.

[0052] To achieve the above functions, the core 110 has good hysteresis characteristics and can have a relatively high magnetic permeability. Specifically, to form the core 110, various metal powders are mixed at a ratio of 4.6 - 5.2 wt% of iron (Fe), 74.3 - 75.6 wt% of nickel (Ni), 12.5 - 13 wt% of silicon (Si), 1.5 - 1.6 wt% of chromium (Cr), and 5.8 - 5.9 wt% of cobalt (Co), and are injection-molded at a temperature of 1300 °C or higher. Considering the magnetic permeability and impact that affect long-distance detection, it is formed into a strip (or tape) shape with a thickness of 0.025 mm or less, enabling thin and lightweight design. Moreover, multiple thin cores 110 formed as described above can be overlapped and integrated.

[0053] Here, since the content of the nickel component accounts for the main weight % in the core 110, it is important to prevent melting when placed at low temperatures, and the above cobalt has the property of a decrease in magnetic characteristics (hysteresis) at the temperature, so it is important that the injection temperature does not rise above 1300 °C. Moreover, since the injection is sensitive to impact, while slowing down the injection speed, it is rapidly cooled to 106 °C / sec, so that the core 110 can have durability.

[0054] As described above, in the case of mixing multiple metal powders, the state of the mixed powder is irregular. Therefore, in order to maintain the particles of the mixed powder in an orderly state in a certain direction, it is heated to a certain temperature and heat-treated until the particles are about to dissolve, and a strong magnetic field is provided so that the particles can be aligned. Moreover, in order to maintain the aligned state of the particles, the core 110 formed through the above process is placed in the magnetic field, magnetic field treatment is performed, and it is slowly cooled. As a result, the hysteresis and permeability of the core 110 can be increased.

[0055] The thinner the thickness of the core 110, the better the characteristics. Moreover, in order to be impact-resistant and light in weight, it is preferably an amorphous or Permalloy core 110. The Permalloy metal has a higher amplitude of change in response to impact than the amorphous metal. Therefore, in the metal detection system of the present invention, an amorphous (amorphous) core 110 can be used.

[0056] The housing 130 can be formed in a cylindrical shape with an internal space, and the housing 130 can be formed of an insulating material. Moreover, the core 110, as a path for the magnetic flux induced by the coil 120, can be formed in the internal space of the housing 130 corresponding to the position of the coil 120 as described above. Moreover, the coil 120 can be formed of a metal wire such as an iron wire, a nichrome wire, or a copper wire.

[0057] The metal detection system of the present invention can measure the movement of at least one object 70. Moreover, it can not only measure the position, direction, speed, etc. related to the movement of the object 70, but also measure the number of objects 70 and the magnetic flux density. Moreover, for this purpose, a plurality of sensor modules 10 are formed, and an impedance matching unit 20 and an amplifier unit 30 can be respectively connected to the plurality of sensor modules 10.

[0058] In addition, the metal detection system of the present invention may further include: a first control unit 41, connected to the amplifier unit 30, for analyzing the waveforms of the amplified current and voltage; and a second control unit 42, connected to the first control unit 41 to generate analysis information of the object 70 for analyzing the movement and magnetic density of the object 70, and connected to the imaging unit 60 to collect imaging images.

[0059] In the embodiment of the present invention, the case where the sensor modules 10 (first to third sensor modules) are arranged at regular intervals is described, but it is not limited thereto, and the configuration of the sensor modules 10 can be changed according to the use of the metal detection system of the present invention, etc.

[0060] As Figure 1 and Figure 2 shown, in the metal detection system of the present invention, the movement path, movement speed, etc. can be analyzed by using the positions, directions, and speeds of the respective multiple objects 70, and the relative movement between one object 70 and other objects 70 can also be analyzed.

[0061] As a specific embodiment, for example, Figure 1 as shown, the first object 71 carried by the first person can move from the left side to the right side in the figure, towards the space between the first sensor module 11 and the second sensor module 12. The second object 72 carried by the second person can move towards the upper side of the second sensor module 12 with reference to the figure. The third object 73 carried by the third person can move towards the space between the first sensor module 11 and the third sensor module 13.

[0062] In the embodiments of the present invention, the case where each person carries their respective object 70 and moves is described, and the case where the imaging unit 60 performs imaging of each person is described. However, for convenience, in Figure 1 and Figure 2 only the object 70 is shown. The object 70 can be carried inside or outside the person's clothes.

[0063] Hereinafter, the movement and number of the object 70 based on each sensor module 10, and the case of generating analysis information of the object 70 based on the measurement of the magnetic flux density and the like will be described.

[0064] The magnetic flux density of the first object 71 can be 5x10-17 T (Tesla), and the speed can be 4 km / h (the walking speed of an ordinary person). The magnetic flux density of the second object 72 can be 3x10-17 T (Tesla), and the speed can be 4 km / h. The magnetic flux density of the third object 73 can be 5x10-17 T (Tesla), and the speed can be 6 km / h.

[0065] Moreover, as Figure 2 shown, the fourth object 74 carried by the fourth person can move in the direction from the second sensor module 12 towards the first sensor module 11. The fifth object 75 carried by the fifth person can move towards the first sensor module 11 and the third sensor module 13. Here, the magnetic flux density of the fourth object 74 can be 5x10-17 T (Tesla), and the speed can be 4 km / h. The magnetic flux density of the fifth object 75 can be 5x10-17 T (Tesla), and the speed can be 6 km / h.

[0066] First, in the analysis of the number of objects 70, when the first object 71, the second object 72, and the third object 73 move as described above, in the first sensor module 11, the second sensor module 12, and the third sensor module 13, signals are generated in the sensors 100 due to the movement of each object 70. The signals of each sensor 100 can be transmitted to the first control unit 41 via the impedance matching unit 20 and the amplification unit 30 connected to each sensor module 10. The first control unit 41 analyzes such multiple signal patterns, thereby being able to determine the number of objects 70 passing near each sensor module 10. Data on each signal pattern based on the magnetic flux density and speed of each object 70 and the composite pattern when two or more signal patterns as described above overlap are stored in the first control unit 41. The first control unit 41 analyzes each signal pattern, derives the number of signal patterns inherent to the object 70, and thereby can analyze the number of objects 70 passing through the metal detection system of the present invention. Here, data for each signal pattern or composite pattern can be experimentally stored. However, for the signal separation technique for a specific object 70, other existing techniques can be used.

[0067] The principle described above can also be equally applicable to the case where the fourth object 74 and the fifth object 75 move. As a result, by the analysis of the first control unit 41 as described above to determine each object 70, the signal pattern for each object 70 can be separated.

[0068] In the embodiment of the present invention, although the case where one person carries one object 70 is described, it can also be the case where one person can carry two or more objects 70, or two or more people carry one object 70. That is, the carrying relationship between the person and the object 70 is not limited. Therefore, it is also necessary to determine the number of objects 70 carried by the person. For this purpose, by using the following imaging unit 60, a composite analysis in which the sensor module 10 and the imaging unit 60 are interlocked can be performed. This will be described in detail below.

[0069] In the analysis of the movement path, movement speed, and magnetic flux density of each object 70, each object 70 is determined by the signal pattern analysis of the first control unit 41, and the signal pattern for each object 70 can be transmitted to the second control unit 42. Moreover, the second control unit 42 can analyze each signal pattern to analyze the movement path and movement speed of each object 70.

[0070] Specifically, as Figure 1As shown, when the first object 71, the second object 72, and the third object 73 move in a straight line in one direction (reference direction), each object 70 is determined as described above. Thus, the signal patterns for each object 70 are separated by the first control unit 41 and transmitted to the second control unit 42. The second control unit 42 analyzes that each object 70 forms a signal pattern of a certain intensity for each sensor module 10. Thereby, it can be determined that the first object 71, the second object 72, and the third object 73 are moving in the same direction, and the magnetic flux density and moving speed of each object 70 can be judged by the signal patterns of each object 70. Here, similar to the first control unit 41, data on each signal pattern based on the magnetic flux density and speed of each object 70 is stored in the second control unit 42, and the second control unit 42 can utilize the stored data.

[0071] Moreover, as Figure 2 shown, in the case where the fourth object 74 and the fifth object 75 move in different directions respectively, each object 70 is determined as described above. Thus, the signal patterns for each object 70 are separated by the first control unit 41 and transmitted to the second control unit 42. The second control unit 42 analyzes the phenomenon that the intensity of the signal pattern of the fourth object 74 gradually increases in the first sensor module 11 and gradually decreases in the second sensor module 12, and the pattern of such intensity change, etc. It can be judged that the fourth object 74 moves at a certain angle with respect to the reference direction (the direction in which the fifth object 75 moves), and the magnetic flux density and moving speed can be judged by the signal pattern of the fourth object 74. The analysis of the movement of the fifth object 75 can be the same as the matters analyzed for the first object 71, etc. above.

[0072] Hereinafter, the analysis of the object 70 using the information of the above sensor module 10 and the captured image will be described.

[0073] As Figure 1 and Figure 2 shown, at least one or more imaging units 60 are formed, and a captured image of the entire area measurable by the sensor module 10 can be obtained. The imaging unit 60 can be configured in various ways corresponding to the configuration of the sensor module 10. Moreover, as the imaging unit 60, all means capable of obtaining an image such as a camera and an image sensor can be used.

[0074] It is possible to analyze the object 70 by using the information based on the sensor module 10 and the image obtained through the imaging unit 60, that is, the captured image. To this end, the second control unit 42 can perform the classification of the object 70 by using the analysis information of the object 70 and the captured image. Here, the second control unit 42 can analyze the captured image to determine the type of the object 70 after determining whether the magnetic flux density of the object 70 is included within a predetermined magnetic flux density range. As described above, the analysis information of the object 70 may include information such as the quantity of the objects 70, the movement paths and movement speeds of the respective objects 70, and the magnetic density of the respective objects 70.

[0075] The second control unit 42 can determine the object 70 having a magnetic flux density within a predetermined magnetic flux density range. That is, the second control unit 42 can determine whether a specific object 70 passes through the metal detection system of the present invention. Specifically, as described above, the first control unit 41 identifies each object 70, separates the signal pattern of each object 70, and transmits it to the second control unit 42. The second control unit 42 analyzes the transmitted signal pattern of the object 70 and can determine whether the magnetic flux density of the object 70 is included within a predetermined magnetic flux density range. That is, the iron content in each object 70 passing through the metal detection system of the present invention is different, resulting in different magnetic flux densities. The magnetic flux density of a specific object 70 type can be included within a predetermined magnetic flux density range. Therefore, the second control unit 42 can use the magnetic flux density of a certain object 70 to determine whether the object 70 belongs to a specific object 70 type.

[0076] Specifically, in the case of firearms, through the forging process, it can contain a relatively high density of iron components and have a relatively large magnetic flux density. Thus, the magnetic flux density of firearms can form a predetermined magnetic flux density range. When the magnetic flux density of an object 70 is included within the magnetic flux density range of firearms, the second control unit 42 can determine that the object 70 belongs to the firearms category.

[0077] However, when performing the discrimination of the object 70 only based on the magnetic flux density as described above, an object 70 that does not belong to the firearms category but has a magnetic flux density within the magnetic flux density range of the firearms category may be determined to belong to the firearms category. Therefore, after performing the preliminary analysis of the type of the object 70 as described above, a secondary analysis using the captured image can be performed. Hereinafter, an object 70 preliminarily classified as a firearm based on the magnetic flux density may be referred to as a suspected firearm object.

[0078] As described above, in the case where a suspected firearm object is detected, a captured image of the suspected firearm object or a person carrying the suspected firearm object can be transmitted to the second control unit 42 in real time. Images of objects 70 corresponding to various firearms are stored in the second control unit 42. The second control unit 42 compares and analyzes the suspected firearm object with the stored images, thereby being able to definitely determine whether the suspected firearm object belongs to the category of firearms.

[0079] However, when immediately performing the judgment of the suspected firearm object using the captured image as described above, it may be the case where the suspected firearm object is exposed outside the person carrying the object 70. On the other hand, when the suspected firearm object is located inside the person carrying the object 70, that is, when the suspected firearm object is hidden between the person's clothes, etc., it may be difficult to immediately compare and analyze the captured image with the images stored in the second control unit 42 as described above.

[0080] For the above situation, the imaging unit 60 can have a thermal sensing function. When a suspected firearm object is detected but the second control unit 42 does not detect a firearm in the captured image, the second control unit 42 transmits a control signal to the imaging unit 60. The imaging unit 60 that receives the transmitted control signal starts to activate the thermal sensing function, and as a captured image of a person being tracked who may be carrying a suspected firearm object, it can collect a thermal image and transmit this thermal image to the second control unit 42, so that the second control unit 42 can determine whether there is a firearm between the person's clothes, etc. For this judgment, when the thermal imaging function of the imaging unit 60 is executed, even if the firearm is between the person's clothes, its shape will be revealed due to the temperature difference, so it can be executed.

[0081] When the second control unit 42 determines that the object 70 is a firearm, it can generate a warning signal. Moreover, the metal detection system of the present invention can further include an output unit 50, which is connected to the second control unit 42 and visually outputs the position change of the object 70 and outputs a warning signal.

[0082] The warning signal can be transmitted to the output unit 50, and such a warning signal can be realized visually or audibly. Moreover, when it is definitely determined in the second control unit 42 as described above that the suspected firearm object belongs to the category of firearms, the captured image of the person carrying the object 70 can be transmitted to the communication device of the security personnel.

[0083] Moreover, the output unit 50 receives the transmitted information from the second control unit 42, can represent the three-dimensional coordinate change of the movement path of the object 70 as a chart or an image, etc., and can display numerical information such as the movement speed and magnetic flux density of the object 70 on the screen.

[0084] As described above, the magnetic flux density is initially used to determine a suspected firearm object among multiple objects 70, the position of the suspected firearm object (or the person carrying the object 70) determined as described above is tracked, and the object 70 analysis information and camera image of the suspected firearm object are secondly used to perform an analysis of the suspected firearm object, thereby significantly improving the detection speed of the firearm object 70.

[0085] Moreover, since the measurement of the object 70 is performed in a composite manner using the analysis information of the object 70 based on the sensor module 10 and the camera image based on the camera unit 60, the measurement accuracy of the object 70 can be improved.

[0086] Although the matter of determining the firearm object 70 is specifically described in the embodiments of the present invention, the type of the determined object 70 is not limited to the firearm type, and this principle can also be similarly applied to other objects 70.

[0087] Hereinafter, the setting of the sensor 100 included in the sensor module 10 will be described. Figure 8 It is a schematic diagram of the sensor 100 based on the third embodiment of the present invention, Figure 9 It is a schematic diagram of the sensor module 10 based on the third embodiment of the present invention. Moreover, Figure 10 It is a schematic diagram of the sensor module 10 based on the fourth embodiment of the present invention.

[0088] As Figure 3 , Figure 4 , Figures 7 to 10 shown, multiple sensors 100 can be arranged in parallel or radially. First, the case where multiple sensors 100 are arranged in parallel will be described.

[0089] As Figure 3 and Figure 4 shown, multiple sensors 100 are arranged in parallel, and the positions of the core 110 and the coil 120 with respect to one housing 130 can be different from the positions of the core 110 and the coil 120 with respect to other housings 130. Specifically, the 1-1 sensor 101 and the 1-2 sensor 102 among multiple sensors 100 can be aligned and arranged in parallel, the 1-1 core 111a and the 1-1 coil 121a can be formed on the right side of the 1-1 sensor 101, and the 1-2 core 111b and the 1-2 coil 121b can be formed on the left side of the 1-2 sensor 102.

[0090] As Figure 3 , Figure 4 and Figure 7As shown, when the iron (Fe)-containing object 70 moves from the left side to the right side in the figure towards the sensor 100, a magnetic field change is instantaneously generated in the core 110, whereby a micro-voltage and a micro-current can be induced and generated in the coil 120. At this time, in the part where the N pole and the S pole of the iron (Fe)-containing object 70 are switched, that is, the non-polar part ( Figure 7 denoted by A in the figure), when passing through the 1-1 core 111a, the generation of the voltage and current induced by the 1-1 core 111a and the 1-1 coil 121a provided in the 1-1 sensor 101 may be interrupted. Here, not only in the case where the magnetic force lines are not affected by the non-polar part at all in the 1-1 core 111a and the 1-1 coil 121a, as Figure 7 shown, even if the magnetic force lines have a partial influence on the 1-1 core 111a and the 1-1 coil 121a, when approaching the non-polar part, the magnetic flux density significantly decreases, and the generation of the induced voltage and current may also be interrupted.

[0091] On the other hand, at the same moment, the 1-2 core 111b and the 1-2 coil 121b provided in the 1-2 sensor 102 are affected by the magnetic field distortion caused by the N pole or the S pole generated by the iron (Fe)-containing object 70, that is, affected by the magnetic field movement of the iron (Fe)-containing object 70, so that a micro-voltage and a micro-current can be induced in the 1-2 coil 121b.

[0092] Moreover, one end of the coil 120 provided in one sensor 100 can be connected to one end of the coil 120 provided in other sensors 100, and the other end of the coil 120 provided in one sensor 100 can be connected to the other end of the coil 120 provided in other sensors 100. Thus, the wires of one sensor 100 and the wires of other sensors 100 can be connected with the same signal.

[0093] Specifically, when an induced magnetic field is generated in the core 110 and the coil 120 (the 1-1 core 111a and the 1-1 coil 121a) provided in a certain sensor 100 and the core 110 and the coil 120 (the 1-2 core 111b and the 1-2 coil 121b) provided in other sensors 100, a micro-current and a micro-voltage are generated in the coil 120 provided in one sensor 100, so that a positive electrode and a negative electrode can be formed, and a micro-current and a micro-voltage are also generated in the coil 120 provided in other sensors 100, so that a positive electrode and a negative electrode can be formed. At this time, the positive electrode of the coil 120 provided in one sensor 100 can be connected to the positive electrode of the coil 120 provided in other sensors 100, and the negative electrode of the coil 120 provided in one sensor 100 can be connected to the negative electrode of the coil 120 provided in other sensors 100.

[0094] Through the connection of such the same signal, as described above, when passing through a sensor 100 at a non-polar part of an iron (Fe)-containing object 70, even if the generation of current and voltage in the coil 120 of one sensor 100 is interrupted, current and voltage are still generated in the coils 120 of other sensors 100, and the sensor module 10 can work continuously and normally.

[0095] The impedance matching unit 20 is connected to wires respectively connected to a plurality of coils 120 and can perform impedance matching. The impedance matching unit 20 reduces reflections caused by impedance differences between signals (micro current or micro voltage) transmitted from both ends of each sensor 100, reduces signal loss, and thus can maximize signal transmission efficiency. Moreover, the amplification unit 30 includes an amplification circuit for amplifying the transmitted signal and can amplify the signal transmitted from the impedance matching unit 20 and transmit it to the first control unit 41.

[0096] The first control unit 41 analyzes the waveform of the amplified signal and can determine whether the iron (Fe)-containing object 70 has moved or the sensor module 10 itself has moved.

[0097] The first control unit 41 can be implemented by a signal processing module such as a microcomputer or an FPGA and can apply software algorithms (SW algorithms). The SW algorithm can determine whether the moving object is the iron (Fe)-containing object 70, the sensor 100 included in the sensor module 10 itself, or both, according to the fact that the signal pattern information when the sensor 100 itself moves is different from the signal pattern information when the iron (Fe)-containing object 70 moves.

[0098] Specifically, as described above, the sensor 100 also responds to a micro magnetic field. Therefore, when the sensor 100 itself moves, the sensor 100 forms a signal pattern when it is affected not only by the magnetic field change caused by the relative displacement between the iron (Fe)-containing objects 70 but also by the magnetic field change of the earth or other surrounding objects 70. On the other hand, when the iron (Fe)-containing object 70 moves, the sensor 100 is only affected by the magnetic field change caused by the relative displacement with the iron (Fe)-containing object 70 and can form different signal patterns in each case. Moreover, according to the same principle, when the iron (Fe)-containing object 70 and the sensor 100 move simultaneously, other different signal patterns can be formed.

[0099] As described above, in each case, different signal patterns are formed, and the signal patterns formed in each case are stored in the first control unit 41, and reference data can be formed. Here, the signal patterns in the reference data stored in the first control unit 41 can be experimentally derived. The first control unit 41 compares and determines the signal pattern transmitted from the amplification unit 30 with the signal patterns in the reference data of the first control unit 41 to analyze similarities, etc., so as to determine whether the iron (Fe) - containing object 70 has displaced or whether the sensor 100 has displaced.

[0100] The second control unit 42 receives information for determining whether the iron (Fe) - containing object 70 has displaced or whether the sensor 100 has displaced and data on the signal pattern waveform from the first control unit 41, and can analyze the actual displacement path of the displaced object. The second control unit 42 can be implemented by a signal processing module such as a microcomputer or an FPGA, and can apply software algorithms (SW algorithms).

[0101] Specifically, the signal pattern for the displacement of the iron (Fe) - containing object 70, the signal pattern for the displacement of the sensor 100, or the signal pattern for the simultaneous displacement of the iron (Fe) - containing object 70 and the sensor 100 can be respectively stored in the second control unit 42 to form reference data. Here, the signal patterns of the reference data stored in the second control unit 42 can be experimentally derived.

[0102] The second control unit 42 first determines the displacement - occurring object according to the information transmitted from the first control unit 41. After selecting the data type related to the displacement - occurring object from the reference data of the second control unit 42, it compares and determines the waveform of the signal pattern transmitted from the first control unit 41 with the signal patterns in the reference data of the second control unit 42 to analyze similarities, etc., so as to be able to perform coordinate changes based on the displacement of the iron (Fe) - containing object 70 or coordinate changes based on the displacement of the sensor module 10, etc.

[0103] Although the case where the first control unit 41 and the second control unit 42 are connected in sequence is described in the embodiments of the present invention, it is not limited thereto. The first control unit 41 and the second control unit 42 can be in a parallel or independent structure.

[0104] That is, as described above, in addition to separating the signal patterns to determine the object 70, the first control unit 41 can also determine whether the object 70 has displaced or whether the sensor module 10 has displaced. While analyzing the movement path and movement speed, etc., of the object 70, the second control unit 42 can analyze the movement path of the sensor module 10.

[0105] Next, the case where multiple sensors 100 are arranged radially is described. InFigure 8 and Figure 10 in, each region indicated by a double-dashed line may be a measurable region (range) of each sensor 100 corresponding to each region.

[0106] In Figure 8 and Figure 10 in, for ease of understanding, the measurable regions of each sensor 100 are shown slightly reduced, but not limited thereto, and the measurable regions of each sensor 100 may be formed larger. Moreover, in Figure 10 in, for ease of understanding, the connection of wires etc. is omitted, and only the configuration of the sensor 100 is shown.

[0107] As Figures 8 to 10 shown, a plurality of sensors 100 are respectively arranged radially. Specifically, the 3-1 sensor 103 and the 3-2 sensor 104 among the plurality of sensors 100 can be formed radially. (Although there are other sensors 100 that form radially, for ease of explanation, only the 3-1 sensor 103 and the 3-2 sensor 104 are given symbols and described.)

[0108] As described above, when a plurality of sensors 10 are arranged radially, the respective measurable regions of the plurality of sensors 100 are adjacent or cross-formed, and the detection efficiency of an object detected by the non-polarity correction and displacement measurement device of the present invention can be significantly improved. In particular, as Figure 10 shown, when a plurality of sensors 100 are arranged in a three-dimensional radial configuration, the measurable regions based on the plurality of sensors 100 can be formed into a spherical shape. Thus, as described above, the following effects can be obtained: not only is the detection efficiency increased, but also it is easy to detect an object regardless of the direction of movement of the object along the xyz axes. Moreover, when a single sensor 100 is arranged separately, it may not be easy to perform a configuration design considering the measurable region of the sensor 100. However, when a plurality of sensors 100 are arranged radially and the non-polarity correction and displacement measurement device of the present invention formed as described above is used, a measurable region such as a cylindrical shape or a spherical shape is formed, so that it is easy to calculate the measurable region and it is easy to design the detection region of an object.

[0109] In Figures 8 to 10In the case where the iron (Fe)-containing object 70 moves from the left side to the right side in the figure towards the sensor 100, a magnetic field change is instantaneously generated in the core 110, whereby a micro voltage and a micro current can be induced and generated in the coil 120. At this time, when passing through the 3-1 core 113a at the position where the N pole and the S pole of the iron (Fe)-containing object 70 are switched, that is, the non-polar part, the generation of the voltage and current induced by the 3-1 core 113a and the 3-1 coil 123a provided in the 3-1 sensor 103 may be interrupted. Here, not only in the case where the magnetic force lines are not affected by the non-polar part at all for the 3-1 core 113a and the 3-1 coil 123a, but even when the magnetic force lines have a partial influence on the 3-1 core 113a and the 3-1 coil 123a, since the magnetic flux density significantly decreases when approaching the non-polar part, the generation of the induced voltage and current may be interrupted.

[0110] On the other hand, at the same moment, the 3-2 core 113b and the 3-2 coil 123b provided in the 3-2 sensor 104 are affected by the magnetic field distortion caused by the N pole or the S pole generated by the iron (Fe)-containing object 70, that is, affected by the magnetic field movement of the iron (Fe)-containing object 70, so that a micro voltage and a micro current can be induced in the 3-2 coil 123b.

[0111] Moreover, one end of the coil 120 provided in one sensor 100 can be connected to one end of the coil 120 provided in other sensors 100, and the other end of the coil 120 provided in one sensor 100 can be connected to the other end of the coil 120 provided in other sensors 100. Thereby, the wires of one sensor 100 can be connected to the wires of other sensors 100 with the same signal.

[0112] Specifically, when an induced magnetic field is generated in the core 110 and the coil 120 (3-1 core 113a and 3-1 coil 123a) provided in a certain sensor 100 and the core 110 and the coil 120 (3-2 core 113b and 3-2 coil 123b) provided in other sensors 100, a micro current and a micro voltage are generated in the coil 120 provided in one sensor 100 to form a positive electrode and a negative electrode, and a micro current and a micro voltage are also generated in the coil 120 provided in other sensors 100 to form a positive electrode and a negative electrode. At this time, the positive electrode of the coil 120 provided in one sensor 100 can be connected to the positive electrode of the coil 120 provided in other sensors 100, and the negative electrode of the coil 120 provided in one sensor 100 can be connected to the negative electrode of the coil 120 provided in other sensors 100.

[0113] With the connection of this same signal, as described above, when the non-polar part of the iron (Fe)-containing object 70 passes through a sensor 100, even if the generation of current and voltage in the coil 120 of one sensor 100 is interrupted, current and voltage are still generated in the coil 120 of other sensors 100, and the sensor module 10 can operate continuously and normally.

[0114] The remaining matters regarding the impedance matching unit 20, the amplification unit 30, the first control unit 41, and the second control unit 42 are the same as those regarding the impedance matching unit 20, the amplification unit 30, the first control unit 41, and the second control unit 42 when the plurality of sensors 100 are arranged in parallel respectively as described above.

[0115] As Figure 5 and Figure 6 shown, the multiple coils 120 included in the sensor 100 can be arranged in series respectively. That is, in the sensor 100 included in the sensor module 10, the multiple coils 120 are arranged in series respectively, and one core 110 can be formed separately from other cores 110. Specifically, on one housing 130, the 2-1 coil 122a and the 2-2 coil 122b can be formed in series, and the 2-1 core 112a and the 2-2 core 112b can be formed correspondingly. Here, in the sensor module 10, at least one or more sensors 100 can be formed.

[0116] As Figure 5 、 Figure 6 and Figure 7 shown, when the iron (Fe)-containing object 70 moves from the left side to the right side in the figure in a manner approaching the sensor 100, a magnetic field change is instantaneously generated in the core 110, and thus a micro voltage and a micro current can be induced and generated in the coil 120. At this time, when passing through the 2-1 core 112a at the position where the N pole and the S pole of the iron (Fe)-containing object 70 are converted, that is, the non-polar part ( Figure 7 indicated by A in the figure), the generation of the voltage and current induced by the 2-1 core 112a and the 2-1 coil 122a may be interrupted. Here, not only in the case where the magnetic lines of force are not affected by the non-polar part at all for the 2-1 core 112a and the 2-1 coil 122a, but also as Figure 7 shown, even if the magnetic lines of force have a partial influence on the 2-1 core 112a and the 2-1 coil 122a, the generation of the induced voltage and current may be interrupted because the magnetic flux density decreases significantly when approaching the non-polar part.

[0117] On the other hand, at the same moment, the 2-2 core 112b and the 2-2 coil 122b are affected by the magnetic field distortion based on the N pole or S pole generated by the iron (Fe)-containing object 70, that is, affected by the magnetic field movement of the iron (Fe)-containing object 70. Therefore, a micro voltage and a micro current can be induced in the 2-2 coil 122b.

[0118] Moreover, one end of one coil 120 among the plurality of coils 120 can be connected to one end of the other coils 120, and the other end of one coil 120 can be connected to the other end of the other coils 120. Thus, the wires of one coil 120 and the wires of the other coils 120 can be connected with the same signal.

[0119] Specifically, when an induced magnetic field is generated in a certain coil 120 (the 2-1 coil 122a) and the other coils 120 (the 2-2 coil 122b), a micro current and a micro voltage are generated in one coil 120 to form a positive electrode and a negative electrode, and a micro current and a micro voltage are also generated in the other coils 120 to generate a positive electrode and a negative electrode. At this time, the positive electrode of one coil 120 can be connected to the positive electrode of the other coils 120, and the negative electrode of one coil 120 can be connected to the negative electrode of the other coils 120.

[0120] Through the connection with the same signal, as described above, when passing through the non-polar part of the iron (Fe)-containing object 70 by one sensor 100, even if the generation of the current and voltage in the coil 120 of one sensor 100 is interrupted, the current and voltage are still generated in the coil 120 of the other sensors 100, so that the sensor module 10 can work continuously and normally.

[0121] The remaining matters regarding the impedance matching unit 20, the amplification unit 30, the first control unit 41, and the second control unit 42 are the same as those regarding the impedance matching unit 20, the amplification unit 30, the first control unit 41, and the second control unit 42 in the case where the plurality of sensors 100 are arranged in parallel respectively as described above.

[0122] In the embodiment of the present invention, although the matters of arranging the respective sensors 100 in parallel in the sensor module 10 and the matters of arranging the coils 120 in series in the sensor 100 are described separately, a plurality of sensors 100 in which the coils 120 are arranged in series can be formed and the respective sensors 100 are arranged in parallel. At this time, the sensor module 10 can be formed such that the positions of the respective coils 120 are different from each other for each sensor 100 to prevent the influence on the non-polar part of the iron (Fe)-containing object 70 as described above. In this case, the above-mentioned structure and principle can also be applied.

[0123] Figure 11 and Figure 12It is a diagram showing a signal pattern when the object 70 passes through the sensor 100 according to the first embodiment of the present invention. Specifically, Figure 11 (a) of Figure 11 is a diagram showing a case where a single sensor 100 according to the first embodiment of the present invention is formed and the longitudinal axis of the sensor 100 is in the vertical direction with respect to the ground. Figure 11 (b) of Figure 11 is a diagram showing a case where the sensors 100 according to the first embodiment of the present invention are arranged in parallel and the longitudinal axis of the sensor 100 is in the vertical direction with respect to the ground. Moreover, Figure 12 (a) of Figure 12 is a diagram showing a case where a single sensor 100 according to the first embodiment of the present invention is formed and the longitudinal axis of the sensor 100 is in the horizontal direction with respect to the ground. Figure 12 (b) of Figure 12 is a diagram showing a case where the sensors 100 according to the first embodiment of the present invention are arranged in parallel and the longitudinal axis of the sensor 100 is in the horizontal direction with respect to the ground.

[0124] As Figure 11 and Figure 12 shown, it can be confirmed that in the case of using the metal detection system of the present invention, regardless of whether the longitudinal axis of the sensor 100 is in the vertical direction or the horizontal direction with respect to the ground, it is possible to easily perform the detection of the object 70 using the sensor 100. Moreover, from the comparison between the case of using a single sensor 100 and the case of using a plurality of sensors 100 arranged in parallel, regardless of the non-polar part of the iron (Fe) object 70, it is possible to normally and continuously measure the displacement occurrence of the iron (Fe) object 70.

[0125] With the above-described structure, it is possible to detect changes in the micro-magnetic field and magnetic flux of the iron-containing object 70, and it is possible to detect the position, displacement, etc. of the iron-containing object 70 with ultra-low power. In addition, as described above, even in the range where the magnetic field of the object 70 weakens, that is, the non-polar range, it is possible to perform magnetic field detection of the iron-containing object 70 by other adjacent sensors 100 or coils 120, and the sensor module 10 can operate normally and continuously.

[0126] In addition, as described above, it is possible to minimize other effects caused by the setting direction of the sensor 100 with respect to the ground, etc., and it is possible to perform detection and measurement regardless of the configuration of the sensor module 10, etc. In addition, in the case of configuring a plurality of sensor modules 10 to form the metal detection system of the present invention, it is possible to judge and utilize information on the moving path, moving speed, magnetic flux density, etc. of the iron-containing object 70.

[0127] Moreover, since the metal detection system of the present invention can detect changes in the micro-magnetic field and magnetic flux of the iron-containing object as described above, it can exhibit the same performance regardless of the influence of air, soil, water, etc.

[0128] The above description of the present invention is only for illustration, and those skilled in the art can understand that without changing the technical idea or essential technical features of the present invention, it can be easily deformed into other specific forms. Therefore, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each structural element described as an independent type can also be implemented dispersedly, and similarly, the structural elements described in a dispersed manner can also be implemented in a combined form.

[0129] The scope of the present invention is represented by the claims, and it should be interpreted that all changes or deformation modes that can be derived from the meaning and scope of the claims and the concept of equivalence are included in the scope of the present invention.

[0130] Description of Reference Numerals

[0131] 10: Sensor module 11: First sensor module

[0132] 12: Second sensor module 13: Third sensor module

[0133] 20: Impedance matching unit 30: Amplification unit

[0134] 41: First control unit 42: Second control unit

[0135] 50: Output unit 60: Imaging unit

[0136] 70: Object 71: First object

[0137] 72: Second object 73: Third object

[0138] 74: Fourth object 75: Fifth object

[0139] 100: Sensor 101: No. 1-1 sensor

[0140] 102: No. 1-2 sensor 103: No. 3-1 sensor

[0141] 104: No. 3-2 sensor 110: Core

[0142] 111a: No. 1-1 core 111b: No. 1-2 core

[0143] 112a: No. 2-1 core 112b: No. 2-2 core

[0144] 113a: No. 3-1 core 113b: No. 3-2 core

[0145] 120: Coil 121a: No. 1-1 coil

[0146] 121b: First - second coil 122a: Second - first coil

[0147] 122b: Second - second coil 123a: Third - first coil

[0148] 123b: Third - second coil 130: Housing

Claims

1. A metal detection system using a search coil type sensor, characterized in that, Comprising: A sensor module including at least one sensor for detecting moving objects around. The sensor includes a housing, a core, and a coil. The housing has an internal space, the core is formed to be introduced into the internal space of the housing, and the coil is wound around a part of the outer peripheral surface of the housing corresponding to the position of the core; A camera unit for photographing the object moving around the sensor module or the person carrying the object; An impedance matching unit connected to the sensor module to perform impedance matching; And An amplifying unit connected to the impedance matching unit to amplify the micro current and micro voltage generated when the object approaches the sensor module, The sensor module forms an induced magnetic field through the change in distance from the iron-containing object, Analyzing the object by using the information based on the sensor module and the photographed image obtained by the camera unit, The metal detection system using a detecting coil type sensor further includes: A first control unit connected to the amplifying unit; And A second control unit connected to the first control unit and the camera unit, The first control unit is configured to: Store data of each signal pattern of the magnetic flux density and speed for each object among the multiple objects detected by the sensor module and the composite pattern when two or more signal patterns overlap, Determine each object among the multiple objects by separating each signal pattern to generate separated signal patterns of the multiple objects; The second control unit is configured to: Receive the separated signal patterns of the multiple objects from the first control unit, Collect the photographed images photographed by the camera unit, Determine whether the magnetic flux density of each of the multiple objects is included within a predetermined magnetic flux density range to classify each of the multiple objects, When each of the multiple objects is exposed, use the photographed image to determine the type of each of the multiple objects, When each of the multiple objects is not exposed, use the thermal sensing function of the camera unit to determine the type of each of the multiple objects by collecting the thermal images of each of the multiple objects.

2. The metal detection system using a detecting coil type sensor according to claim 1, characterized in that When the object is determined to be a firearm, the second control unit generates a warning signal.

3. The metal detection system using a search coil type sensor according to claim 2, characterized in that, It further includes: An output unit connected to the second control unit to visually output the position change of the object and output the warning signal.

4. The metal detection system using a detecting coil type sensor according to claim 1, characterized in that A plurality of the sensor modules are formed, and the impedance matching unit and the amplifying unit are respectively connected to the plurality of sensor modules.

5. The metal detection system using a detecting coil type sensor according to claim 1, characterized in that The plurality of sensors are respectively connected in parallel or arranged radially.

6. The metal detection system using a detecting coil type sensor according to claim 1, characterized in that The plurality of coils provided in the sensor are arranged in series.

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